Shields made up of materials 1, 4 and 5 can be used for mobile phone shielding.
After all the above analysis, it is observed that shields made up of conductors and insulators cannot be used for mobile phone shielding.
From Tables 4 and 5, it is observed that a good amount of SAR reduction is achieved using shields made up of materials 1, 2, 3, 4, and 5. Shields made up of materials 1, 4 and 5 will be better mobile phone radiation shield as they have a negligible effect on mobile phone antenna performance.
Hence, a shield made up of an insulator cannot be used for the mobile phone radiation shielding purpose.
Hence, a shield made up of a conductor cannot be used for the mobile phone radiation shielding purpose because they degrade the mobile phone antenna performance.
In this paper, modern type of mobile phone with the shield is tested.
It products include mobile phone series connectors, shield, slide, shaft, metal exterior parts, precision surface mount LED brackets, and electric products packaging materials.
Fig. 9 Return loss of mobile phone antenna with shields made up of insulators Fig. 10 3D radiation pattern of the mobile phone antenna with the shield of 0.1 cm thickness made up of materials: a without shield, b teflon without slit, c teflon with slit, d glass without slit, and e glass with slit Fig. 11 SAR measured for the insulator shield.
Fig. 7 Return loss of mobile phone antenna with shields made up of conductors Fig. 8 3D radiation pattern of the mobile phone antenna with the shield of 0.1 cm thickness made up of materials: a without shield, b aluminium without slit, c aluminium with slit, d copper without slit, and e copper with slit.
